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San Tan Valley, AZ Weather. The average temperature of San Tan Valley is 71.43Â°F, which is much higher than the Arizona average temperature of 65.97Â°F and is much higher than the national average temperature of 54.45Â°F. Historical Weather. Heating Cost Index, #76.
0am:The Golden Valley, AZ forecast for Mar 31 is 52 degrees and Partly cloudy. There is 26 percentage chance of rain and 18 mph winds from the Northwest. 3am:The Golden Valley, AZ forecast for Mar 31 is 52 degrees and Clear. There is 26 percentage chance of rain and 13 mph winds from the Northwest.